Which sum or difference identity could be used to prove that cos(270º - thata) = -sin thata is an identity?
1 answer:
You might be interested in
Answer:
≈ 62.8
Step-by-step explanation:
Using the equal ratios of
=
, that is
=
= 5, thus
5 × sector = 100π ( divide both sides by 5 )
sector = 20π = 20 × 3.14 = 62.8 units²
